Study on EAHE system combined with several components in the Medan city

Energy demand for space cooling and heating in buildings is a primary contributor to the total building energy consumption. Its rapid increase calls for an urgent need to utilize renewable energy sources and associated energy-efficient technology in the building sector. Among different renewables, geothermal energy has been widely adopted due to its easy access and low impact on the environment. The method for this research uses EAHE (Earth-Air Heat Exchanger) and utilization of solar energy as air conditioning. The study aimed to determine the variation in output temperature of EAHE for each given mass flow rate, the efficiency of the solar collector, the efficiency of the solar chimney and output power, and the efficiency of photovoltaics as a blower current source. In this study, ambient air is circulated into the pipe with a speed varying at 3 m/s and 2 m/s. From the experimental results obtained that at an incoming airspeed of 3 m/s obtained the average output temperature for the experimental results of 27.93 °C with an average entry temperature of 33.79 °C. While for the entry air speed of 2 m/s obtained the average output temperature for the experimental results of 28.81 °C with an average entry temperature of 32.15 °C. The effectiveness of this heat exchanger was obtained by 81.34% for the entry air speed of 3 m/s and 77.19% at 2 m/s. The efficiency of solar collectors was obtained by 79.76%, and the efficiency of solar chimney was obtained by 58.38%. As well as the output power of the first photovoltaic of 50.03 Watts with an efficiency of 9.82% and from the second photovoltaic of 50.84 Watts with an efficiency of 10.33%.